Ron Johnson <[EMAIL PROTECTED]> writes:
> How about (if you don't already do it) ranked (or approximately
> ranked) b-tree indexes, where each node also stores the (approximate)
> count of tuple pointers under it?
> This way, the planner would know whether or how skewed a tree is,
> and (approximately) how many tuples a given WHERE predicate resolves
> to.
Why is that better than our existing implementation of column statistics?
regards, tom lane
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